Furnace for calcining or burning briquets of ore.



No. 832,358. ATENTED UGT. 2, 1906.

E. J.' BEBGEN'DAL y 1EURNAGE FOR GALCININGDR BURNING BRQUETS" OEE' ORE.

APPLIOALTIOII PLED APR. 8, 1905.

No'. 832,358. PATENTBD 00in 2, 1906. LJ. BERGENDAL. PURNAGB Foa CALGINING 0R BURNNG BRIQUETS 0F ORE. APPLIGATONTILBD PR. 8,1905.

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Speccation of tlottero Tri-attent Patented Oat. 2, F356.

Application lu pril 5,19%. Serial En. 254,597.

ol" Swodon., have useful lmprovoloro@ and Eurams? di .Wings Thisnvooton oln-tos to impovsmonto effecting o. better utilization of the hoot ml at uoo economical proceduto in furnaces for smla' purposes, especially in furnaces whore tho orlquots, oiled up ori oallages, are @3.1% lied through an extended, 'tufzmooclmm oer post gos-combustion room o1 Chmn 'n the same/ nwl'ch tho 'for the oolonlngandbmnr groogonomtod. n 'fammes of thls class the ai? t 1 combustion passes through the fummo-o 'in o. doot'on opposite tothat o'f the orragos. im to? having paosotl over oar- 'oges l l; quoto and having been heatotl )Root-ts 1t arrives ot the time oomlmstblo is introduced.

the zmoompo..- vlog dftwmgs, which il El. CombosLilou-dimmlos?J into which at 'the same illustrato an ombod'mon of tho invention, Figure l 1s o.. longltmmol vor-tical section of the famoso. l." 7. mlm? seotioo, ou a.

Y. iogol'sozt tho combustion 'viviamo sooo in .2; xg. poctivoly fmticol um, tino latter line- 5 :1. o scalo. of o @ovl-r soon :tt r. iight 'in Fig. llgs. 6 m15. '"7 respectively longitudinal :md tmlis voso cation of tho ca'rriogfos for tlv@ xquots. Fig. is .it plan view or diagram showing the monitor in. which tho lorqoots Stacked ot Cor 5Fl-imo uf Ionttutlmal work from tho hoot form, 'with th bo ttom ,Y

tight olmxmol, The colliages .tl the' bruin-ots am successively moved post tho commotion-chamber '7. Combustible gas in. nooossfuy tplanttios is iotz'ocluceil into the Soif ,hfmi'ol through o, channel It. Cor.- bustonw onters the furnace through s. olxannol 9, passes through the channel .montionod above and formed by the carriages and the bottom 2 to the rear ond 1l of the furnnco, Wl'tlch and also is oloslefl by o sliding oounte'rbztltuootl loo? i0, whit-.lx twins ouml the fro and of tho ootomost corxztgo of tho otv and thon. jvassos over the appel sido of tho carriages. Conooquontly the airpa-ssng over tho hot lquots coming from the oombustion-clmmael' '7 is heated by the some and finally arrives ttt the said chamber. The pl'oducts ol" combustion poos over unburnetl byiquets and leave the tunaoo through o. olumnol 30 leading to the ohmnoy.

lu tummoos of this class hitherto usod the Comoustion of the is not so lively as i" noctml the 'Whte gaia... ofm1lnutowmlambo ghost hozhootofl to the moossory too o tute, oatlj/ of foot that oi' tho 1 tloolm tot?. l is vofy flo'l'octvo wing to time foot that the aotl tho solo all* f( n two parallel ouz'axxts. )j u and. tho if, oll thomoxe ilolectvo its the lighter gusoumront passers ove? the heztvm o-omroot. vvofof.)ver. combustion olf the mxtuio of; the oost o i?. ty o?? 'modo/1l upon too Woot 'o poton ol tho furrmce, :m consequently @moot gommate the foot www l uuloso g-"oot oonttios ol woll. The solo. d' proioiont vspooftllqv on gos dost foi-nooo pool lo Mitt migo is r1 l for tlm l'flv oo'nbugtlon ol wllioln tlw fsztjng, with imftto no sillo and possible, which chamber, besides, inust be s b,

arrangedthat the mixture' 'utf-gaas andvair strikes against a heatedy body ot a material which is a bad oonductorotheat, .as tirebrick. The said disadvantagesfare removed .bv shortening the combustion-chamber 7 to a outseven feet, corresponding to the len th of a carria e, and asin accordance with t 'sA invention y introducing an air-current into the combustion-chamber in su ch manner that it cuts the currents of' gas and heated air mentioned above, and'thus forces thesaine into each other, mingling the saine. Means for introducing such a mingling air-eurrent is shown in Fig. 1 and in detail in Fi s. 2 and 3.

In the roof of the combustion-chamber 7 a slot 12 is provided, extending across the chamber. Abox 1'3 is mounted above the slot. The 'said box-communicates with a fan 15 through a tube 14;, which ian preferably sucks the air through a device for the heating A' Off the same described'in the following. The

gie, as indicated in Fig. 2.

air pressed into the combustion-chainber through the slot 12, t'e quantity of which is adjusted by means of a suitable damper-21s, for instance, a plate 16, loosely placed in the box-causes-the gas coming from the channel Sand the air heated by the bri uets to min- In t is figure the dotted line 17 indicates the tops of the briquets placed on the carriages.

of the upper layer also have an oblique posi- `intensity of the combustion tion, but in a direction opposite to that oi the briquets in the lower layer. By the said arn ran ement (seen in Fig. 8) the niainy portion of t e air is compelled to pass over the briuets. Bythe minglingo eration effected by t e air-current coming tl rough the' slot 12 and reverberation caused by the wall 18 of the combustion-chamber the combustion will become lively and confined to a smaller space-fi. e., it becomes more intense. The

recess is ind body or gas creased also by the well-mixe i and airbeingforced against the strongly-heata stop-valve or damper 25,

oi the tube 26 is ci cast-iron and is provided ed wall 18 of the combustion-chamber. The combustion is greatly facilitated if the air entering through the slot 12 is heated. Such heating is effected according to this invention by a device by means oi' which the heat of the bri uets withdrawn from the furnace utilized. The said device consists ot a cap or cover 19. (See Figs. i and 5.) The said can is suspended in chains 20, running over rolf ers 21, j ournaledon uprights 22, the said capA being counterbalanced by means of' weights 23. A tube 24 extends upward 'from the top of the cap and slides in a tube 26, of iron, leading to the tan. 15 and rovided with I"he lower end The briquets. stand upright and are arranged in two layers,

senese Qwith two inner anges 3 27, guiding the tube 124 o the cap Iand tightening against the "same The tube 24.- has an outer iange, ,alsoguidingthe tube and forming a tightening means between the tubes. The can is mount ed at the ydischarge end 11 ct t .e furnace. Asa carriage 29 with hot briquets has been moved out of the -furnace the cap is pulled down and placed over the bri uets, so that it incloses the bod ot briquets y its side-rind end walls, and t e roei o the cap rests uponv the briquets or is at a short distance iront-the V'same- The side and end walls ot the cap are so adapted that they do not reach to the frame of the carriage or the brickwork on the same when the capvis lowered, a slet of suit-- able width beingleft betweenthe brickworii and the bottom edge of the cap; l#Echsequently the air is sucked through-the said slot, passes between the briquets, andlnally arrives strongly heated into the tube 24, then passing through the tubes I2b le' and,'into the combustion-chamber 7 After the cooling of the briquets the damper 25 is shut and the cap 19 ispushed upward. A carriage-with hot briquets having been again withdrawn, the saine proceeding is performed as'relcbntly described. if in a plant -wit two or 'more furnaces the tubes 26 belonging to the same communicate, the running of the furnaces' can easily be so regulated that a carriage with bricuets always is being subjected 'to the coo ing operation'. in this manner the variations of the tem erature of thehea'ted air entering through the slot 12 are reduced..

ln addition tothe heating ot the air by the' briquets the advantage of a more livelyoin dation of the briquets and cooling of the same is gained, which imparts to the. bri nets ing of the briquets and the vfollowing treatment of the saine being thus `facili.tated, as the briquets have been found to be stronger lwhen in a cooled condition than in the heated one. w

If the highest air'passing over t air entering throu yIiossible temperature of the h the slot 12 is sinned at, it maybe effects by increasing theziength of the portion of the furnacesurwhich the briquetsare preheatedewl. e.,'ironi tiiecharging 'end 3 to the combustionfchainher 7'-- while the length of the cooling pcrtinn'is sub# stantially the same as hitherto'. Bysuch an briquets i and is consequently heated to a a considerably greater strength-fthe un oadi arrangement the speed of the carriages can be ZIO e briquets, aswell asVof-the i ige gained: first, an increase ond, a decreased consumption ofgas.; third, a more complete oxidation 4of the briquetsg.

v stesse higher temperature.

. fourth, a more intense heat in the combuszotion on the carriages mentioned above, the

tion-chamber and in consequence thereof a more Areliable removal of the sulfur when necessary; iifth, in consequence of the great quantityy ot air which is sucked by the fan between-the briquets on the carriage subjected to the cooling operation, and consequently come more intimate contact with rthe. I e

` I claim as new,

heated briquets thanthe air passing through disadvantage' of an eventual dissociation of peroa'id' of ,iron-fi. e., loss of oxygen--caused by a high temperature for the removal ofsultur ior instance, -will be perfectly eliminated,

and, sixth, owing to the tact that the tempera- 'ture of all the 'combustion-air is higher than hitherto itis possible to use gas poorer in heat units than gas hitherto employed.

Accordin to the rabove description the air I heated by t ie briquets under the cap is used exclusiveg in the furnace for the purpose stated. vidcntly, however, a portion of the air or the whole quantity 0i air may be used,

' or its heat may be utilized also for other purouses, for wet concentrates, and the like.

ll the length of the furnace Jforni a tight or' poses-as, for instance, the heating of store- 'lhe arrangements shown and described ma? be Inodiiied in many respects without eXcee ing the limits of this inventionaa for instance, a plurality of slots or openings, such as 12, may be employed. The invention has been. described above as applied to furnaces for calcining and roasting briquets of ore. It may, however, be applied also to other furnaces for similar purposes. .e

The means whereby the carriages which substantially tight channel beneath or below them will be seen-iii Figs. 6 and 7. In Fig. 6, 31 is the tongue on the end of one carriage Thereis, moreover, in the briquets when removed from, the furnace portion whereof 29,;en aging a notch oriecess 32 in the other end Ao the next carriage 29. Each carriage will be provided at one end with a tongue 31 and at the other end with a recess 32. Fig. 7, which illustrates only one of the two like sides of the carriage, shows a pendent flange 33,0511 the frame. of the carriage di ping into a trough 34 containing sand. In ig. 8, l) vdesignates the briquets.

I am aware that in certain kinds of reheatling (welding) furnaces blast-pipes are used at an angle .to the gas-current and serve exclusively for the combustion oi the gas, and forl I that reason I do not claim such a blast device broadly. u

Having now described my invention, what ters Patent, is#

1. Aurnace for the purpose specified, having an 'elongated main chamber, a combustionchamber opening into said main chamber at its upper part, an inlet-,in the upper part of the main chamber for a combustible gas, means for compelling the flow oi a current of cornbustion-air'a-longi the roof of said main chamber past said gas-inlet and to the combustion-chamber, and means for injecting into the combustion-chamber, at an angl'e to the axis of the main furnace-chamber,

i a'current of aeriform'luid for ettectinr the proper mixing ot the combustion air and gas.

2. Afurnace for the purpose specified, havin a combustion-chamber 7,.,provided with in ets iorcurrents of combustible gas and air, and with an inlet 12 for aeriform fluid under pressure, means 'for compressing said iiuid and supplyingl it to said inlet 12, the path of which inlet is disposed at'an angle to lthe paths of said currents oi combustible gas and air, a cap 19 ada ted to be placed over the het briquets wit idrawn from the furnace,

and a conduit connecting saidy cap with the induction side of the fluid-compressing means.

In witness whereof I have hereunto signed my naine in the Vpresence of two subscribing witnesses. i FILIPJOI-IN BERGENDAL.

Witnesses.: ERNST SvANQUis'r,

ROBERT APELGREN.

and desire 'to secureby Let- SSl 

